Hi Maria, is there a particular field you know you might want to go into?
Politics, economics, law and psychology are all good subjects, but possibly not together. It really depends on where you want to go to university. Some universities will favour a combination of the social sciences (like your subjects) along with more academic subjects such as history, maths, sciences or languages.
I think the important thing to note is, for example, no university requires you to have studied law at A Level to undertake a degree in it. The same applies for politics and psychology (as far as I'm aware, other posters feel free to correct me if I'm wrong.). If you're thinking of doing economics, it's advisable to do maths A Level alongside it as it is very maths-y.